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Tamm plasmons in TiO2 nanotube photonic crystals / M. V. Pyatnov, R. G. Bikbaev, I. V. Timofeev [et al.] // Photonics. - 2023. - Vol. 10, Is. 1. - Ст. 64, DOI 10.3390/photonics10010064. - Cited References: 40. - This research was funded by Russian Science Foundation and Krasnoyarsk Regional Fund of Science, project № 22-22-20078, https://rscf.ru/project/22-22-20078/ (accessed on 01 January 2023) . - ISSN 2304-6732
Кл.слова (ненормированные):
photonic crystals -- titanium dioxide -- absorbers -- anodization
Аннотация: The anodic TiO2 photonic crystals evoke great interest for application as photocatalytic media due to high absorption of light resuling from their specific structure. In this work, the optical properties of the photonic crystal based on a bamboo-type TiO2 nanotube with a metallic coating are analyzed theoretically by the finite-difference time-domain method. The occurrence of Tamm plasmons that appears as a peak in the absorption spectrum is predicted. A Tamm plasmon polariton is a localized state of light excited at the boundary of two highly reflective media, a metal and a Bragg reflector. The integral absorption of the gold-, titanium-, and titanium nitride-coated photonic crystals in the wavelength range of 450–600 nm is calculated. It is established that the titanium nitride-coated structure exhibits the maximum integral absorption.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russia
Siberian Federal University, 660041 Krasnoyarsk, Russia
Institute of Computational Modelling, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Pyatnov, M. V.; Пятнов, Максим Владимирович; Bikbaev, R. G.; Бикбаев, Рашид Гельмединович; Timofeev, I. V.; Тимофеев, Иван Владимирович; Ryzhkov, Ilya I.; Vetrov, S. Ya.; Ветров, Степан Яковлевич; Shabanov, V. F.; Шабанов, Василий Филиппович
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Cyclic voltammetry as an activation method of TiO2 nanotube arrays for improvement of photoelectrochemical water splitting performance / N. A. Zos’ko, A. S. Aleksandrovsky, T. Kenova [et al.] // ChemPhotoChem. - 2023. - Vol. 7, Is. 9. - Ст. e202300100, DOI 10.1002/cptc.202300100. - Cited References: 36. - The authors express their gratitude to A. M. Zhizhaev for the microscopy and XRD analysis and V. F. Shabanov for the fruitful discussion. - This work was conducted within the framework of the budget project FWES-2021-0023 for Institute of Chemistry and Chemical Technology SB RAS using the equipment of Krasnoyarsk Regional Research Equipment Centre of SB RAS . - ISSN 2367-0932
Кл.слова (ненормированные):
cyclic voltammetry -- electrochemical anodization -- photoelectrochemical activity -- TiO2 nanotubes -- water splitting
Аннотация: A facile and eco-friendly method for activating anodic TiO2 nanotubes (TNTs) by cyclic voltammetry (CV) is proposed, and photoelectrochemical properties of CV-activated TNTs are compared with those of non-activated TNTs and of TNTs activated by hydrogen-thermal reduction. EPR and luminescence studies show that the pristine samples demonstrate rather large content of paramagnetic and luminescing defects, while hydrogenation and CV-activation lead to the different type of rearrangement of defects. TNTs activated by CV-Na2SO4 demonstrate significantly improved photocurrent density (2.25 mA cm-2) in comparison with that of the hydrogen treated and pristine ones (0.93 mA cm-2 and 0.31 mA cm-2) under NUV-irradiation at 0.2 V (RHE). Enhanced photoactivity of Na2SO4-activated TNTs correlates with higher luminescence quantum yield, lowest paramagnetic defects content and larger decay time of the luminescence. Thus, a decrease in the content of defects is an important factor that reduces the non-radiative recombination of charge carriers. The activation-induced redistribution of surface and bulk defects in nanotubes explains the increased photoelectrochemical activity of TiO2-based anodes. Cyclic voltammetry has been proved to be a reliable method to increase the efficiency of TNTs in PEC water splitting.

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Держатели документа:
Laboratory of Catalytic Transformations of Renewable Resources Laboratory of Molecular Spectroscopy and Analysis Institute of Chemistry and Chemical Technology, SB RAS FRC «Krasnoyarsk Science Center SB RAS»,Krasnoyarsk, 660036 (Russia)
Laboratory of Coherent OpticsL.V. Kirensky Institute of Physics SB RAS FRC «Krasnoyarsk Science Center SB RAS»,Krasnoyarsk, 660036 (Russia)
Siberian Federal University, Krasnoyarsk, 660041 (Russia)

Доп.точки доступа:
Zos’ko, Nikolay A.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Kenova, Tatyana; Gerasimova, Marina A.; Maksimov, Nikolay G.; Taran, Oxana P.
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